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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23190f3fb944e4e572e5b20b1784446ef8a77161bdf47dc2dd20c90c23d332f' 
  AND token = '9XFye3jgsonYWzO80K03wYhrUUEu4DMOBh32ktLBqfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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