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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2aebee488954561f55ab4db1c819c6b4e0dbe2c5e8c4c9ad1823f6977fd2f9' 
  AND token = '6EPNI92d4cFGqddLHvaPi1TgpGDY8px8/LiSXdPvV0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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