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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fe0083e87acdfa605c738c471bba1894b4da37d3ca4b8c508985c54dc1d4ef' 
  AND token = 'mcrKhHT5/dlX7G/P+DgcFDX15aW6xOyeLrUajBamoyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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