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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0e17f85bffd90a2883abb6ded042509972aed20a418d32c28ea11c51fb7c66' 
  AND token = 'qVMNObhqjKa7d3o1fjZYDS8Oc/p2ndqyhy8bhEQib9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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