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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849d03a960a8748c5ad701f5f563699ea3d0a2d80a990436d8cd7dd216ef275c' 
  AND token = 'aYaOfSn5MO8VdGRme7OQIourWtPI37IQD7co85VVsBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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