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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd980b70430a286c5e0d9964e22a8662e06ba2d85f282750c3295107f8e529ba0' 
  AND token = 'CNf5tDVMRqdRkW2bJ8Ym5Qm/ON1joSNR1u/3AKAzAXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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