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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73acb67b7d00227c30a67168894663b16713e770b2e70e45d3a703bb2f7681f0' 
  AND token = 'by4n+u8hutiBcaczQb+K2Ti1nxlLXFk9wQhs7VG9/YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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