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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03d2f204de4efed31a31916b2b77d929d59f2469af8bc72818c4f8f4f9123f4' 
  AND token = 'yXf/893MOblabre2611U338BuvhVHtxmx5ficO0qWfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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