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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f2fde04af7fd0e6d992c4b34a3bb10aff5b0c9e5e7fb585da107469732e6b0' 
  AND token = '/Hq949MD/Tddi+kKhyJno0/nOX/jj6gqm7sHBNmaxoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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