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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b37dc915ff0c4c94f5f67ffbdf93c804d83ef6d89d29b7c676ccf90ee4a8a7' 
  AND token = 'xAtPUHrAsGIvKO/EJxL7LlRI3/JZiR3E40IpJ3e9zhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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