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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb83291389f0c46c3be548f0d53ad6a20bf8d484d11ca8d2946e62661904fb41' 
  AND token = 'D5UY7vAQ2ofgTGrGb0OZl2D7gdEHilxrIPg2qzUlPvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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