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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65dbd6a0edc1330d190083b2f7c7769219a9974f0c441bb4afe376c3a5f4d00e' 
  AND token = '9yR0yGnLl8uIQYKQHoSX51P6Cu5htZRfQJsJ90SaN5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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