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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c9ff7f8af63b7380213432fe2579fd03bbb636e2024629eecc6ef7125a4d7a' 
  AND token = '2S1ngoeRyg4Svfke7nFNYWs7QPPd8CIpvif2rXX1hKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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