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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe9a207db74d3f193c21bc88e9da788c5f11a5b4a9105e970d5cd1dc10fcd2d' 
  AND token = 'eXfn4vEgUGPR5b3I8yeDgGteLF2x2j1qoPP2M94bTNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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