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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e0dd2f3882707f4f14c88c45b54447d9e792582aa8fcec98c5b83a4ce582f1' 
  AND token = 'meYGjy6K5NhYsfvEMpfXrXC1JVzbMJes5pegNRzmNZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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