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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbd0e2e7a8d3d7fcc27121ef800844466388a5283a432cc8d0742ce752e5a22' 
  AND token = 'QxlQxbEdysdA9KejkTSjDnykdZ5uqgclY7fH2/L8pIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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