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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf2c012ab00618373a0f50e9f2caaced0f2c21bfcf11991a109af047c359be4' 
  AND token = 'wkG4l+IONd+yJVwJudgF6Mk4OhXBxNY+gjafYcdzdmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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