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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebdc2de22d9ff7cc37e0e1f52b2acd3d1ae6125d4798a7ac1c45df40c62728e' 
  AND token = 'GoZsvSqh82cMJ4t1LJ/93ucxhQcOkUbySqDrjy1Sv7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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