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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '220ccb0c542a7161e051b536f20d2d3cbeda6b6ee8255bd2bd61a34e9f5937d3' 
  AND token = 'eEXtnN9P1xRUaKIGJtCPxMSeRLECAlCwGepYWY4twuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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