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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8c468e7fd8b35a6b52a783fcbd1d1da8bdf52947548077e211d00ed8647624' 
  AND token = 'paYt44Dt83ufGftnF625oOhQ1J3uoZQktn//CbNVFas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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