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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859d3aaf47cf03163b2d51a922ab49dbdd48e770eff4155e132e69d9c96e9871' 
  AND token = 'Q+IKzHYOsH05NPNm5Akgya6IUEYdRSipWzJpqNbD3sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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