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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e9af882b5db5ce778841ab5cbbc79a4e02cf40a393b5aefe14f0c5f96e9bcf' 
  AND token = 'wYnnv+QmpwkBR2EfTsBH9BB0iwT7pHIvWwlTGO61B38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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