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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32aec6e333651fd6fb5aad924db6a9eef041c7af332c5c3aad755c2b8e604e6' 
  AND token = 'pf8QxJ1pHOrY4Ku0CiGBJAjY2nmYqAPHJkY9sNJb9Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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