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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2dd19f236927581a4ad1c210e4b89d5ec5b20ec374dd739820c4b3788a3422' 
  AND token = 'egwwAKjNmMfiWI5ilfxNemxqG88E+eiMM2AieyppzBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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