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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9508b77192bc385e28f7b895ea0b984472c2e5cb56b0248ba3f08e8bf71a815' 
  AND token = '62A08Y2ROJA0odvkbFdASgB2//SVtWjw7Hk7isLLxe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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