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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831256649529bea18d307d477d9184c8f2c3f8696b7a42107eca4cff9b7c7898' 
  AND token = 'es4BrVy3DftXutS84kJ96VAPBSWjOgQwA3bwnBxxtcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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