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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064882b580368fd0c7fa6ba052dbb9223b51d986852233c95ebf3585a5153b40' 
  AND token = 'U7thsVQmCxISidx0z4M9iwxwctNv39LySAuFCLZe8SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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