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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddef9ee89c4ce5b87968385a29ab1393cf47cd525a1240bf17cebe45ec5d3f3' 
  AND token = 'pZ/L9uuljmRkBWOq/KOSpTe3P6R+IRdZjWt8Pe0Et9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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