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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f1b02b0a80e7e408ecd7a2a1cfbd8f87b3845e351f55a0f7ae0bdab26c2d7a' 
  AND token = 'W9lk7JgY0G9SDuxG+VwX7WBfC9BJsYucqSjfTWwAicU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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