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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c526dc2c3425651113e6bc964c6faae73b6bdc0dc442647a5c5ae89ae84707' 
  AND token = 'jfRZc50QD4LAlh8xHVJ68d7PiHCmIlyJqVsorNjiGso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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