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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a893069004b1aad60f67b0d022b74b7418f2bc5e90e438370a9601f2e3b7931b' 
  AND token = 'ROh0/N9x2Zcq5JFL/vZYR7aXOZmdUS9sY2sZqMr3zBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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