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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e9569ac624e2b186f662dc4f7d554a96c8329cf9217c396d579aa5f36cb024' 
  AND token = 'nf8x7GE6iOuYH+d7yjtkQwOTLj53zBz6vTLIoSuQRdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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