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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21732027f257f6235e69ab1dc682f450c5b37836cd9b4fb4c92000f5e5a62d8' 
  AND token = 'xc5PHQm7tqWyHuzOmInePzBcMjKimGsRH2marJROqAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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