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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69b6e083043249371d0faf9e68fb5a160a5246de01a341cccaf6e9adcbcf0b7' 
  AND token = 'ZH4g4ECzQUCy0yDDTwrNkkQznBB/+hG6P6TY7WHTyFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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