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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4924b5122ac52757d32b0c0f1eb2e4f9b4e7c221c1b99b5ce07e2b9d2b7ff7c' 
  AND token = 'nYTpP8hSx/c+GFi2b3Wwlqgi1yro6I+iWnFroX9ABZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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