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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2163f595bc0d5c14ccc55b58b38fcffd9d62d285d06d469fce455f96c1c1e6a0' 
  AND token = 'LdmxhPXF0JN4GfzGIzwrYgckgrJGv2gcrNBYJ2n5j1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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