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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66909adec02c7eecc10b98257a98feca1c2c7f12c08fef6cf3eea86fb5b9c822' 
  AND token = 'SP8udsM5eoOQ65T3R/9pGN06l57hIVAMg4dd0yzGNJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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