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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6f007894940aedaa0425131c3e009cd11470247c7f59741557b80305676e6f' 
  AND token = 'jrvB9n01dRbbpdPdlMoztDdpvKeJ9xjJcfkZtunt6Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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