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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5596974e97fe0cc802603365ac98f43fbe2e73e3c90c16d23c50ad862447bbb3' 
  AND token = 'AyeLEtxujwaKu2EEOTbYMKyw5xQDP81m1KUE+HzRiGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}