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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b7458150d882fd99c08693f1c1d88e483f53e86f158926e2da8cb539fda820' 
  AND token = 'zoNNvd+BlzHKM9i1TfnFegQYyud4Ny7M7+k9I5JtPp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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