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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8600adc2a5250805abccdb77779686938f1a79c7989510c75947c2badbe27e3f' 
  AND token = 'MMENQX+ElPJ4Ini4OHCOMUSPjMv2HcM104cLB+/Hz9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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