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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c19c52c1ae35d236711eb3291108a0a7574850ebdeec3170476f8289348c26' 
  AND token = 'k2h4EerX1eKlEqP4QZe8Zp7JGRz4aHwH1MaOXK/uWU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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