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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe64d9f6b01391c45343a58f1be77941641b981ab8da0cc2474261bf5341056' 
  AND token = '0Pxe/PWWUG912G+FFpbzWQrtjknBI/5E4TPov3NShKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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