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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d614bd3f7b6ece2f045d4413141f2c5f60b34382cf97795a15c129ce1b2722' 
  AND token = '34BnREcSLJMoBsivqnGvUPT9Yd1IZYGtJOzLpdDk/s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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