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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb398d37116c4a5ae8794c60825f4dfa2a56a1ae390e056714724c93145a137' 
  AND token = 'C6TnQ6/i5W+atlj3Bs91UxqehMKXdQpnKBMAhTZYdLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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