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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7856452a579f31ec627c0d3df7dd46489e180aa8ca04b8135a10a1997b5e30' 
  AND token = 'EMfjnRvC1utMije7MshJqppQq/3n4CO7OGsDvZJWkEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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