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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62bfae88897bb499e4835e38090c9c2e413bacdbcc3b93e24ee079d64c5acfe' 
  AND token = '+q2ND5MV5BZQcio1JLzfKxoaKmP5CrqoWoZJ/GIfaw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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