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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6a2bb648b9ee5ee4fa4caec90b6decc71b39028a9ee3aaf217cc63956e0359' 
  AND token = 'KrjuyBnAi1oW9AoWxXqXI/SWOj4TrtUNb5Jqc+4dOh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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