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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c91b0a08809abdc63be6a4a816e41f5ad0c33f9dab4e49684eb756d9b55ea3d' 
  AND token = 'BWedXHA9n3uKfi+RplqjsS6NxOjHQXdU/BAI0iY8U5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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