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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1827b78cda5357a8b476c6341f9af6b046a09d2c6ea1160b1e7f6dd817456a8' 
  AND token = 'm95586rm/TH+hx7a+Y8NXgKutfJkgwfT80tPIDvEnDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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