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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481473ae0d0e3639a7b40b89551a424db184ef271b35f002dfe19f4315d6a23c' 
  AND token = 'PkPwJ4LKlsA9JQzntjOIc5hLxOJD7r/q1q4ibpljt7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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