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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff20afa0d50faad48710908d54ea6b2b911a6357d3c7a0aa43e2ab750fa6b6f1' 
  AND token = 'hglk/9wSjq5eQp+FGfPLCiAhCQgboAb8D1rnlhbQVJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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