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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e671fb1658d49b3b8fcc2a8ad3018b01ca9287bd4983b713c60cb1d89fd6db50' 
  AND token = 'ZPHj+WcD8on6sktLN1BZXe5BjM9tdZmisbPbGJ9lWGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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