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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e8f7134244341c6ee1a0ed47e9ef67ab14ce3e98114f6e8a45616ed2e50093' 
  AND token = '6QKLDkwtxZTCEavEP1BXQZL/uMcptaSZln+Lv3z/TG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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