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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19a37cef8ce13f4737aa1dbc148957a71b2b8b56d3bdba5e40c9972669b6d00' 
  AND token = 'VgvnW7CIY42br45vYh9C6jhcK6iN4wFFdREU1xuXz8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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