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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a6953f2f00704c0c807be116f15ac05fe3910578f122dc7ed88fed983c2f78' 
  AND token = 'BBDXlOEe//OFNCGjP65UmFZ/8c93mo7z3zJoZqn+9d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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