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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffd90f85f3c97f7e6a6933554a07bad04669a22a33125ec609b3cab5c389fea' 
  AND token = 's/8+FZuuHP31n06IbGkmt5deFU6opjit0O4yMxWGNlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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