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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23d1eef4fbf23ca4158d1e2c0510f71937a781ae089408356506637f92fcf1e' 
  AND token = 'oRRI0siet/S667aqd945Z3N7HZifbmFP9YtkpdqecZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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